If you're looking for a note-taking app that syncs across all platforms -- or just an easy way to keep track of your digital odds and ends -- Evernote is a worthwhile download.
If you like word games or puzzles, then Ruzzle is one of the best available. But consider getting the ad-free and more feature-packed premium version.
Terraria is an incredibly involved and challenging game that's worth buying as long as you play it on the iPad.
Fast and exciting gameplay makes Kingdom Rush Frontiers a must-have pick for tower defense fans.
Though the ads are distracting for a paid app, Bridge Constructor remains a fun, addictive game that’s sure to challenge you with each level.
As it's a free upgrade that gives you more apps, improved features across the board, and better performance, there is really no reason not to get Mavericks on your Mac.
If you don't mind the limited streaming library, Netflix offers great picture quality, smooth controls, and reliable performance.
Whether you're a regular Google+ user or just interested in the app's photo-editing or auto-upload features, Google+ for Android is a must-have.
With its impressive menu of listening options (particularly for premium subscribers), Slacker Radio is one of the best streaming-music apps on the market.
With an elegant interface, weather information, and interactive maps, Yahoo Weather is a must-have for weather watchers everywhere.
Inrix Traffic for Android is a good trip-planning supplement for accurate travel time estimates, but you'll need a primary navigation app for turn-by-turn navigation.
Asphalt 8: Airborne is probably the best arcade racing game I've seen yet, with tons of light-hearted racing fun, but you'll have to fight the urge to spend your money.
Though it's a niche product, Thunderspace is a worthwhile download, with realistic-sounding storms that make for a relaxing experience.
Though it lacks stabilization features, Horizon's simple interface and problem-solving purpose make it is easy to recommend.
Lollipop is a tasty update with a candy-colored, cohesive design and updated core features.
Shadowmatic is worth the pocket change for its unique perspective, but a better progression of difficulty would make it a more engaging play.
With simple gestures for inbox management and an incredibly useful built-in calendar, Microsoft Outlook for iOS is a must have.
As far as free theft-deterrent and motion-notification systems go, Salient Eye has the lock on simplicity.